BIT-python-min-2026-7210: The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection

Published May 11, 2026
·
Updated

xml.parsers.expat and xml.etree.ElementTree use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.

Affected Software

2 affected components
Python Software Foundation Python
Expat project Expat<2.8.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade libexpat to a version that resolves this vulnerability.

    Fixed in 2.8.0

Event History

May 11, 2026
CVE Published
via OSV·05:19 PM
Data Sourced
via OSV·05:19 PM
DescriptionSeverityWeakness

Company

Resources

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